Does anyone know the code to switch off the seatbelt alarm? I don't have the manual so I need someone to post it for me.

 

Why wouldn't you keep the manual in the Jeep?
Why wouldn't you download one from the Jeep website?

Anyway, here it is:

The Enhanced Warning System (BeltAlert) can be enabled
or disabled by your authorized dealer or by
following these steps:
NOTE: The following steps must occur within the first
60 seconds of the ignition switch being turned to the ON
or START position. The manufacturer does not recommend
deactivating the Enhanced Warning System
(BeltAlert).
1. Turn the ignition switch to the OFF position, and
buckle the driver’s seat belt.
2. Turn the ignition key to the ACCESSORY/RUN position
(engine does not need to be running), and wait for
the Seat Belt Warning Light to turn off.
3. Within 60 seconds of starting the vehicle, unbuckle
and then re-buckle the driver’s seat belt at least three
times within 10 seconds, ending with the seat belt
buckled.
4. Turn the ignition key to the OFF position. A single
chime will sound to signify that you have successfully
completed the programming.
The Enhanced Warning System (BeltAlert) can be reactivated
by repeating this procedure.
NOTE: Although the Enhanced Warning System
(BeltAlert) has been deactivated, the Seat Belt Warning
Light will continue to illuminate while the driver’s seat
belt remains unfastened.